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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43dafa78a459f8751ab31258f85e54daa3a61af99d6b041c5be3ab60dd56e061' 
  AND token = 'xVJZr9oEKO+r4NHkRZzb6FNsU85+q6QdauR2fcdGYSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}